REACTION OF OXYGEN AND SULFUR-DIOXIDE WITH CU(100)-C(2X2)-MN SURFACE ALLOY

The adsorption of oxygen and sulphur dioxide onto a Cu(100)-c(2 x 2)-M n surface alloy at room temperature has been studied by high resolutio n photoelectron spectroscopy. The interaction of O-2 with the surface alloy leads to oxidation of Mn and promotes of oxygen chemisorption co mpared with a Cu(100) surface. SO2 adsorption causes oxidation of Mn a nd leads to the production of chemisorbed sulphur and oxygen as well a s surface complexes of SO3 and SO4. Sulphur adsorbed on different site s and SO3, SO4 bonded with dissimilar geometries have been identified by their well-separated S 2p binding energies. A mechanism is proposed for the reaction of SO2 with the Cu(100)-c(2 x 2)-Mn surface. (C) 199 8 Elsevier Science B.V. All rights reserved.